In this section, we apply FP techniques to decouple the numerator and denominator of the SINR term in (REF ), which are both functions of the two optimization variables of interest.
Although (REF ) features a summation of the logarithm of ratios instead of a summation of ratios, the recent advances in FP theory, namely the quadratic transform in [1]}, [2]}, allow us to apply FP to a function of a ratio as long as the function is nondecreasing and concave. Hence, this section applies the quadratic transform approach to recast
(REF ) into a series of convex optimization problems and solve them iteratively.
